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  Visualizing weakly bound surface Fermi arcs and their correspondence to bulk Weyl fermions

Batabyal, R., Morali, N., Avraham, N., Sun, Y., Schmidt, M., Felser, C., et al. (2016). Visualizing weakly bound surface Fermi arcs and their correspondence to bulk Weyl fermions. Science Advances, 2(8): e1600709, pp. 1-7. doi:10.1126/sciadv.1600709.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-527F-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-5281-0
Genre: Journal Article

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 Creators:
Batabyal, Rajib1, Author
Morali, Noam1, Author
Avraham, Nurit1, Author
Sun, Yan2, Author              
Schmidt, Marcus3, Author              
Felser, Claudia4, Author              
Stern, Ady1, Author
Yan, Binghai5, Author              
Beidenkopf, Haim1, Author
Affiliations:
1External Organizations, escidoc:persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863425              
3Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863415              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863429              
5Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863427              

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 Abstract: Fermi arcs are the surface manifestation of the topological nature of Weyl semimetals, enforced by the bulk-boundary correspondence with the bulk Weyl nodes. The surface of tantalum arsenide, similar to that of other members of the Weyl semimetal class, hosts nontopological bands that obscure the exploration of this correspondence. We use the spatial structure of the Fermi arc wave function, probed by scanning tunneling microscopy, as a spectroscopic tool to distinguish and characterize the surface Fermi arc bands. We find that, as opposed to nontopological states, the Fermi arc wave function is weakly affected by the surface potential: it spreads rather uniformly within the unit cell and penetrates deeper into the bulk. Fermi arcs reside predominantly on tantalum sites, from which the topological bulk bands are derived. Furthermore, we identify a correspondence between the Fermi arc dispersion and the energy and momentum of the bulk Weyl nodes that classify this material as topological. We obtain these results by introducing an analysis based on the role the Bloch wave function has in shaping quantum electronic interference patterns. It thus carries broader applicability to the study of other electronic systems and other physical processes.

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Language(s): eng - English
 Dates: 2016-08-192016-08-19
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000383734300030
DOI: 10.1126/sciadv.1600709
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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 2 (8) Sequence Number: e1600709 Start / End Page: 1 - 7 Identifier: ISSN: 2375-2548
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/2375-2548